Yes, looks like a solid update. A nice improvement an existing workhorse. A jack of all trades!
One always wishes for more but you kind of know that what you are getting is an incremental improvement. The dual pixel processing was a surprise.
I currently own the 5D3 and A7R2. The improved 5D4 sensor will be welcomed.
A worthwhile update, no doubt.
But a "jack of all trades"? Some future 5Dmk7 may become one, if by that time Canon drops their Cinema line, of which they are currently so protective. Or a Magic Lantern FW becomes widely available for 5D's, enabling decent movie formats and possibly implementing 4k with supersampling and w/o that horrendous crop... On Nikon ups their game in video dept to the point Canon would have to un-cripple their non-Cinema FF offerings.
One of the reasons my 5Dmk2 is now collecting dust is that, after Sony a6000, I cannot stand its horrible AF (mainly focus/recompose) anymore. Yeah, it was an oh-so-smart move, to cripple 5Dmk2 to "protect" their 1D series, and cripple Ms to protect their DSLRs... Did they make me buy 1D (for AF) or crop DSLR (for size/weight)? Nope, they made me switch.
Canon obviously have some other people in mind, not me, when they decide on feature sets of their products. OK, fair enough, who am I to question their ways? Net result though is that I for one watch new Canon offerings as if they were in some parallel universe. Interesting, yes, but completely irrelevant.
shadowblade noted that there weren't much interest... Well, that (^^^) was why; at least for me.